CVE-2026-98552

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98552", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.356Z", "datePublished": "2026-10-18T15:18:19.810Z", "dateUpdated": "2026-10-19T09:21:35.261Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:21:35.261Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix a refcount leak in attach_perf_ctx_data()\n\nThe attach_perf_ctx_data() can race on global and !global cases. The\nglobal case is protected by global_ctx_data_rwsem and shares a single\nreference count using perf_ctx_data.global field.\n\nBut when it races with !global case, it may miss to set the global field\nand result in a reference count leak.\n\n CPU1 CPU2\n ----------------------------------------------------------------\n attach_task_ctx_data(.global=1) attach_task_ctx_data(.global=0)\n cd1 = alloc_perf_ctx_data(); cd2 = alloc_perf_ctx_data();\n // { .global = 0, .refcount = 1 };\n\n try_cmpxchg(); // success,\n // task->perf_ctx_data = cd2\n try_cmpxhg(); // fail; old = cd2\n refcount_inc_not_zero(&old->refcount); // success\n // old.refcount = 2\n free_perf_ctx_data(cd1);\n\nThen later detach_global_ctx_data() will see the data but it's not\nmarked as global, so it won't call detach_task_ctx_data()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "506e64e710ff9573fd2b86686528762b7901b5e4", "lessThan": "23250517cd475367653f1e99396967f54c6f1b7c", "status": "affected", "versionType": "git"}, {"version": "506e64e710ff9573fd2b86686528762b7901b5e4", "lessThan": "5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72", "status": "affected", "versionType": "git"}, {"version": "506e64e710ff9573fd2b86686528762b7901b5e4", "lessThan": "cca4980630b3c7a85f53cb43c6018184ce5d4e37", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/core.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/23250517cd475367653f1e99396967f54c6f1b7c"}, {"url": "https://git.kernel.org/stable/c/5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72"}, {"url": "https://git.kernel.org/stable/c/cca4980630b3c7a85f53cb43c6018184ce5d4e37"}], "title": "perf/core: Fix a refcount leak in attach_perf_ctx_data()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "23250517cd475367653f1e99396967f54c6f1b7c", "status": "affected", "version": "506e64e710ff9573fd2b86686528762b7901b5e4", "versionType": "git"}, {"lessThan": "5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72", "status": "affected", "version": "506e64e710ff9573fd2b86686528762b7901b5e4", "versionType": "git"}, {"lessThan": "cca4980630b3c7a85f53cb43c6018184ce5d4e37", "status": "affected", "version": "506e64e710ff9573fd2b86686528762b7901b5e4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/events/core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"lessThan": "6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.55", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix a refcount leak in attach_perf_ctx_data()\n\nThe attach_perf_ctx_data() can race on global and !global cases. The\nglobal case is protected by global_ctx_data_rwsem and shares a single\nreference count using perf_ctx_data.global field.\n\nBut when it races with !global case, it may miss to set the global field\nand result in a reference count leak.\n\n CPU1 CPU2\n ----------------------------------------------------------------\n attach_task_ctx_data(.global=1) attach_task_ctx_data(.global=0)\n cd1 = alloc_perf_ctx_data(); cd2 = alloc_perf_ctx_data();\n // { .global = 0, .refcount = 1 };\n\n try_cmpxchg(); // success,\n // task->perf_ctx_data = cd2\n try_cmpxhg(); // fail; old = cd2\n refcount_inc_not_zero(&old->refcount); // success\n // old.refcount = 2\n free_perf_ctx_data(cd1);\n\nThen later detach_global_ctx_data() will see the data but it's not\nmarked as global, so it won't call detach_task_ctx_data()."}], "id": "CVE-2026-98552", "lastModified": "2026-10-19T10:19:11.487", "metrics": {}, "published": "2026-10-18T16:17:07.267", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/23250517cd475367653f1e99396967f54c6f1b7c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cca4980630b3c7a85f53cb43c6018184ce5d4e37"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: perf/core: Fix a refcount leak in attach_perf_ctx_data()", "id": "2555022", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555022"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-911", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nperf/core: Fix a refcount leak in attach_perf_ctx_data()\nThe attach_perf_ctx_data() can race on global and !global cases. The\nglobal case is protected by global_ctx_data_rwsem and shares a single\nreference count using perf_ctx_data.global field.\nBut when it races with !global case, it may miss to set the global field\nand result in a reference count leak.\nCPU1 CPU2\n----------------------------------------------------------------\nattach_task_ctx_data(.global=1) attach_task_ctx_data(.global=0)\ncd1 = alloc_perf_ctx_data(); cd2 = alloc_perf_ctx_data();\n// { .global = 0, .refcount = 1 };\ntry_cmpxchg(); // success,\n// task->perf_ctx_data = cd2\ntry_cmpxhg(); // fail; old = cd2\nrefcount_inc_not_zero(&old->refcount); // success\n// old.refcount = 2\nfree_perf_ctx_data(cd1);\nThen later detach_global_ctx_data() will see the data but it's not\nmarked as global, so it won't call detach_task_ctx_data().", "A flaw was found in the Linux kernel's Performance Counters for Linux (perf) subsystem. A race condition during the attachment of performance monitoring context data can cause the kernel to fail to update tracking flags, resulting in a reference count leak. A local attacker could exploit this vulnerability to prevent allocated kernel memory from being released, potentially leading to memory exhaustion and a denial of service (DoS)."], "name": "CVE-2026-98552", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98552\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98552\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98552.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[506e64e710ff9573fd2b86686528762b7901b5e4,23250517cd475367653f1e99396967f54c6f1b7c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[506e64e710ff9573fd2b86686528762b7901b5e4,5286d4eb5cd7e10d7d93c3cc596e18bc8ad80f72)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[506e64e710ff9573fd2b86686528762b7901b5e4,cca4980630b3c7a85f53cb43c6018184ce5d4e37)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.15,6.15]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.55,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.9,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-18T18:15:15.190193+00:00", "updated": "2026-10-22T22:30:13.433890+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}